One‐Step Solvent‐Free Synthesis and Characterization of Zn_1−xMn_xSe@C Nanorods and Nanowires

Abstract

The carbon‐encapsulated, Mn‐doped ZnSe (Zn1−xMnxSe@C) nanowires, nanorods, and nanoparticles are synthesized by the solvent‐free, one‐step RAPET (reactions under autogenic pressure at elevated temperature) approach. The aspect ratio of the nanowires/nanorods is altered according to the Mn/Zn atomic ratio, with the maximum being observed for Mn/Zn = 1:20. A 10–20 nm amorphous carbon shell is evidenced from electron microscopy analysis. The replacement of Zn by Mn in the Zn1−xMnxSe lattice is confirmed by the hyperfine splitting values in the electron paramagnetic resonance (EPR) experiments. Raman experiments reveal that the Zn1−xMnxSe core is highly crystalline, while the shell consists of disordered graphitic carbon. Variable‐temperature cathodoluminescence measurements are performed for all samples and show distinct ZnSe near‐band‐edge and Mn‐related emissions. An intense and broad Mn‐related emission at the largest Mn alloy composition of 19.9% is further consistent with an efficient incorporation of Mn within the host ZnSe lattice. The formation of the core/shell nanowires and nanorods in the absence of any template or structure‐directing agent is controlled kinetically by the Zn1−xMnxSe nucleus formation and subsequent carbon encapsulation. Mn replaces Zn mainly in the (111) plane and catalyzes the nanowire growth in the [111] direction.

Highly Luminescent ZnxCd1−xSe/C Core/Shell Nanocrystals: Large Scale Synthesis, Structural and Cathodoluminescence Studies

“…Carbon forms the final shell over the nanocrystal since the solidification rate of the nanocrystal core is faster than carbon. 11,12 Temperature-Dependent Spatially Integrated CL Results. Because of the carbon shell encapsulating the nanocrystal core, the surface of the Zn x Cd 1Ϫx Se nanocrystals are very well passivated, to the extent that continuous exposure to the electron beam did not result in diminished luminescence intensity.…”

Palladium-decorated zinc sulfide/reduced graphene oxide nanocomposites for enhanced visible light-driven photodegradation of indigo carmine

“…Semiconductors such as TiO 2 , ZnO, Fe 2 O 3 , CdS and ZnS are proved to be efficient photocatalysts due to their unique chemical and electronic structure. ZnS, a group II-VI semiconductor, is having great interest and has been widely used in photocatalysis for the degradation of various organic dyes [23][24][25][26][27]. However, due to their wide band gap (3.73 eV) the photocatalytic applications are limited in the visible region.…”

Cobalt-doped ZnS-reduced graphene oxide nanocomposite as an advanced photocatalytic material

“…Semiconductors such as TiO 2 , ZnO, Fe 2 O 3 , CdS and ZnS are proved to be efficient photocatalysts due to their unique chemical and electronic structure. ZnS, a group II-VI semiconductor, is having great interest and have been widely used in photocatalysis [24][25][26][27][28]. However, its wide bandgap (3.60 eV) prevents its photocatalytic application in the visible-light region.…”